Note 18 - Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2019		Jun. 30, 2018		Jun. 30, 2017
Net Sales	$ 61,091	$ 58,498	$ 56,532	$ 51,901	$ 57,552	$ 54,834	$ 52,124	$ 51,818	$ 228,022	[1]	$ 216,328	[2]	$ 207,023	[3]
Gross Margin	20,579	19,155	18,548	16,659	18,579	18,217	16,076	16,685	74,941		69,557		62,599
Earnings Before Income Taxes	2,632	3,045	2,991	942	791	2,337	1,097	640	9,610		4,865		1,538
Net Earnings / (Loss)	$ 1,481	$ 2,088	$ 1,926	$ 584	$ 825	$ 1,637	$ (6,521)	$ 426	$ 6,079		$ (3,633)		$ 991
Basic and Diluted Earnings / (Loss) Per Share (in dollars per share)	$ 0.22	$ 0.30	$ 0.27	$ 0.08	$ 0.12	$ 0.23	$ (0.93)	$ 0.06	$ 0.87		$ (0.52)

[1] Excludes $4,879 of North American segment intercompany sales to the International segment and $16,187 intercompany sales of the International segment to the North American segment.

[2] Excludes $6,468 of North American segment intercompany sales to the International segment and $14,239 intercompany sales of the International segment to the North American segment.

[3] Excludes $7,902 of North American segment intercompany sales to the International segment and $11,677 intercompany sales of the International segment to the North American segment.